Improvement in lamps



IINITED STATES DAVID HOWARTH, OF PORTLAND, MAINE, ASSIGNOR TO HIMSELF W. N. GOURLAY, AND S. C. RUNDLETT, OF SAME PLACE.

PATENT OFFICE..

IMPROVEMENT IN LAMPS.

Specification forming part of Letters Patent No. 55,771, dated June 19, 1866.

To all whom 'it may concern Be it known that I, DAVID HOWARTH, of Portland, in the county of Cumberland and State of Maine, have invented a new and useful Improvement in Lamps 5 and I hereby declarc the following to be a full, clear, and eX- act description thereof, reference being made to the accompanying drawings, forming part ot' this specification, in which- Figure 1 shows a side elevation otl a lamp containing myimprovement; Fig. 2, a section ot' Fig. 1.

There are many circumstances, as is well known, under which lamps ot various sizes are employed. Where safety requires, they should be made of brass, tin, &;c.-thatis, ofsome metal so as to preclude the danger ot fracture and eX- plosion. There is always an inconvenience, however, attendant upon the use ot'lamps constructed ot' a non-transparent material, viz., in ascertaining when it requires rellin gand in the act of refilling itself. A lamp so made as to possess all the safety ot' a metal body and yet to have some Ineans by which its contents can be inspected without lremoving the top would be an article of great convenience.

To accomplish this result is the object of my invention.

It consists in inserting in the body ot'alamp a ring of glass constructed as hereinafter' set forth and in such position in the lamp as is least likely to receive any blow or injury from the violent contact of the lamp with any object.

The ring is attached at the. top to the top of the lamp. This is eiected by fitting the ring with a shoulder and a screw, so that the top of the lamp can be screwed thereon in the ordinary manner.

The bottom of the ring is connected to the -bodyot'the lamp by means ot' another shoulder,

against which the metal rests, and is secured by any ot' the ordinary methods. The ring thus inserted at this place is eft'ectually secured from accident by the swell of the body ofthe lamp below and the projecting top thereotl above.

In the accompanying drawings, It shows the ring of glass inserted at the describedplaee inthe body ofthe lamp. d d show the shoulders on the upper side, and o c ou the lower side, thereof'. The drawings also show the form in which the ring is made. t

I am aware ot'Letters Patent granted to Chas. W. Cahoon, February 19, 1861; but my invention embraces a different mechanical construction aud arrangement from his.

I do not claim the combination of an opaque lamp body with a transparent plate secured into one side of the lamp.

What I claim as my invention, and desire to secure by Letters Patent, is-

Inserting into a lamp constructed of any opaque substance a transparent ring ofthe form, in the place and manner, and for the purpose substantially as set forth.

DAVID HOWARTH.

Witnesses:

WILLIAM H. CLIFFORD, HENRY C. HOUSTON. 

